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Abstract

A threshold policy is disclosed to improve the robustness of the minimum response time (MRT)-based strategy. By imposing a threshold on load unbalancing before MRT is applied, the system performance can be improved. More significantly, the strategy does relatively well even if inaccurate transactions characteristics are used.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
52% of the total text.

Threshold Policy for Minimum Response Time Based
Transaction Routing Strategy

A threshold
policy is disclosed to improve the robustness
of the minimum response time (MRT)-based strategy. By imposing a
threshold on load unbalancing before MRT is applied, the system
performance can be improved. More
significantly, the strategy does
relatively well even if inaccurate transactions characteristics are
used.

Let there be
K transaction classes in the system and let txk
denote a class K transaction, k = 1,...,K.
For the k-th class,
transactions arrive according to a time-invariant Poisson process
with rate gk. The mean processing
service demands of an application
processing segment and a database request of txk are ak and bk,
respectively. Both ak and bk can be
estimated by measuring the path
lengths of application processing and database request. For each
database request issued by txk, we assume that an I/O device will be
accessed with a fixed probability pk, and the service time of each
I/O access is exponentially distributed with mean dk. When the
executive of an application processing segment is completed,
transaction txk may issue a database request to the database
partition DBi with probability pki, or may terminate with probability
pKO. The matrix [pki] shows the
distribution of database calls
issued by txk and is referred to as the reference locality
distribution. For a given transaction
txk, we call the processing
system Pi its preferred system if pki is the maximum of pkjj =
1,2,...,N.

When a
transaction being executed at Pi issue a database
request to DBj, where i / j, the database call must be shipped from
processing system Pi to Pj. After the
request gets processed, the
result will be sent back. This is called
a remote database call in
which both Pi and Pj have to perform sending and receiving services.
The service demands of initiating a remote database call and of
receiving the results of the call are referred to as communications
overhead and are assumed to be exponentially distributed with mean c.

As routing
transactions to a non-preferred system increase the
total system load due to remote call overhead, threshold strategy
intends to route transactions to a non-preferred system only when a
sizeable gain in re...